Neoplasms of unknown behaviour of the retroperitoneum are rare and their cause is unknown. The most likely cause is a mutation in a gene which controls the growth and development of cells in the retroperitoneum.
Diagnosis of neoplasms of unknown behaviour of the retroperitoneum is usually made through imaging studies such as MRI, CT scans, and ultrasound. Biopsy of the affected tissue may also be necessary.
Neoplasms of unknown behaviour of the retroperitoneum must be differentiated from other causes of abdominal or retroperitoneal masses, such as cysts, abscesses, and lymphoma.
Treatment of neoplasms of unknown behaviour of the retroperitoneum depend on the type and size of the mass. Surgical resection may be necessary, but chemotherapy and radiation therapy may also be used.
The prognosis of neoplasms of unknown behaviour of the retroperitoneum depends on the type and stage of the mass. Generally, the prognosis is good for smaller masses with limited invasion, but may be poor for larger, more aggressive masses.